<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script type="javascript">
var now=new Date();
var day=now.getDay();
var week;
switch (day){
    case 1:
        week="星期一";
		break;
	case 2:
        week="星期二";
		break;
	case 3:
        week="星期三";
		break;
	case 4:
        week="星期四";
		break;
	case 5:
        week="星期五";
		break;
	case 6:
        week="星期六";
		break;
	default:
        week="星期日";
	   break;
}
alert("今天是"+week);	
</script>
</head>
<body>

</body>
</html>